We present the results of the pilot observations of the Deep
Extragalactic VLBI-Optical Survey (DEVOS). Our ultimate aim is to collect
information on compact structures in a large sample of extragalactic radio
sources (~104 objects) up to two orders of magnitude fainter than
those studied in typical imaging Very Long Baseline
Interferometry (VLBI) surveys up until now. This would
lead to an unprecedented data base for various astrophysical, astrometric
and cosmological studies. The first global VLBI observations of the
DEVOS programme were successfully conducted in May 2002. We selected
sources without any spectral criterion from the Very Large Array (VLA)
Faint Images of the Radio Sky at
Twenty-centimeters (FIRST) catalogue, that are also detected with the
Multi-Element Radio Linked Interferometer Network (MERLIN).
The DEVOS pilot sample sources are in the area of the sky that is
covered by the Sloan Digital Sky Survey (SDSS).
We describe the sample selection and present high resolution 5-GHz radio
images of the sources. Based on the results of
this pilot study, we estimate the outcome of and the resources needed for
a full-scale DEVOS project.

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